Abstract
THE sun, as is well known, is a variable star having a period of approximately eleven years, but, unlike other stars, its variability can be determined from several different visible phenomena and not solely from the total integrated light emitted. As classed among stars, it is not considered, however, as a regular variable, because the approximate period of eleven years is itself made variable through other minor periods of various lengths.
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The Sun's Activity, 1890–1920. Nature 110, 465–466 (1922). https://doi.org/10.1038/110465a0
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DOI: https://doi.org/10.1038/110465a0